Article,

Pressure-induced phase transitions in antiferroelectric CsBi(MoO4)(2)

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JOURNAL OF RAMAN SPECTROSCOPY, 36 (1): 56-62 (2005)
DOI: 10.1002/jrs.1270

Abstract

The high-pressure Raman spectra of antiferroelectric CsBi(MoO4)(2) were measured at room temperature. These studies indicated that this crystal exhibits two pressure-induced phase transitions at 0.6 and 1.0 GPa. The stable phase in the 0.6-1.0 GPa range was identified as having the same structure as the ambient-pressure ferroelastic phase observed below 125 K. The transition at 1.0 GPa is connected with significant distortion of the MoO42- tetrahedra and Bi3+ coordination sphere. The results suggest that the phase above 1.0 GPa may have the same structure as the high-pressure phase observed in KDy(MoO4)(2), KY(MoO4)(2) and KTb(MoO4)(2) crystals. Upon releasing pressure, the high-pressure phase transforms directly into the ambient-pressure phase. The origin of the observed suppression of the intermediate phase is discussed. Copyright (C) 2004 John Wiley Sons, Ltd.

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